The move is meant to boost the Nook over recent tablet introductions and pricing changes from Amazon (NASDAQ:AMZN), including its new Kindle Paperwhite, which also features an illuminated screen for reading in dark conditions.

Most Kindles now feature some form of advertisement. Kindle owners who don’t want to see a promotion every time the turn on their Kindles will need to pay an extra $20.

Nooks don’t feature sponsored advertising.

At its new price, the Nook is the same price as Amazon’s Kindle Paperwhite. However, the Nook comes with an AC adapter. The Kindle Paperwhite arrives with only a USB charger. Paperwhite owners who want to charge from AC outlets will have to fork over another $9.95 to Amazon for an adapter.

Barnes & Noble also recently introduced higher-end versions of the Nook, the 7-inch Nook HD and the 9-inch Nook HD+. The Nook HD is designed to compete with Amazon’s Kindle Fire HD, while the Nook HD+ is meant to take on both the 8.9-inch Kindle HD and Apple‘s (NASDAQ:AAPL) market-leading iPad for a share of the burgeoning tablet market.